cement raw mill

Raw mill

  • Low investment and low operation cost
  • Environmental protection & Dust removel
  • Stable quality of the finished product

Raw mill is generally called cement raw mill, raw mill in cement plant, it refers to a common type of cement equipment in the cement plant. In the cement manufacturing process, raw mill in cement plant grind cement raw materials into the raw mix, and the raw mix is sent to the cement kiln to make cement clinker, next, clinker and other admixtures will be ground into finished cement by cement mill.

As for the type of raw mill, there are two types including cement ball mill and vertical cement mill. In the traditional cement raw mill system, the cement ball mill system is more typical. After technology modification, the vertical cement mill has obvious advantages compared with the cement ball mill, and it is suitable for the large cement production line.

raw mill

Why Choose AGICO CEMENT?

AGICO CEMENT is a raw mill manufacturer from china who has the ability to manufacture cement ball mill and vertical cement mill. As a leading and trusted manufacturer, we had exported many projects of cement raw mill and cement equipment to the countries or regions around the world. Why AGICO CEMENT is popular? 

  • Large production capacity: AGICO has a large area of the workshop of 30,000 square meters, also has advanced equipment and technology for cement equipment manufacturing. The annual production capacity reaches 150,000 tons of equipment and structure parts and 20,000 tons of casting parts. 
  • EPC project: our EPC turnkey project can be applied for both cement plant and cement equipment. EPC project covers project design, cement equipment manufacture, project construction, installation and commissioning, personnel training, after-sales service. 
  • One-stop and customization service: for every client, we will provide an individual solution for different needs of you. Our service includes pre-sale, customization service and after-sale service! 
  • Rich experience: Our cement plant and cement equipment have been exported to many other countries and regions in the world, such as Brazil, Angola, Russia, Vietnam, Mongolia and etc. 
raw mill in cement plant
cement raw mill project

cement raw mill

apply for various types of cement raw materials

vertical cement mill

Vertica raw mill, also known as vertical roller mill, in the 1920’s, the first vertical raw mill in cement plant is designed in German. It is widely used in cement, electric power, metallurgy, chemical industry and other industries.

  • Application: limestone, clay, coal, feldspar, calcite, talc, iron ore, copper, phosphate, graphite, quartz, slag.
  • Capacity: 13-70T/H
Advantages

Low investment: the vertical raw mill set crushing, drying, grinding, grading transportation in one, simple system, compact layout, less space, it also can be arranged in the open air, save a lot of investment costs.
Low operation cost: small energy consumption and less damage reduce the running cost.
Environment protection and clean: small vibration, low noise, and good sealing, the system works under negative pressure, no dust overflow.
Stable quality of raw mix: because the material stays in the raw mill for a short time, it is easy to detect and control the product size and chemical composition, reduce repeated grinding, and stabilize the product quality.

how it works?

Main motor drive a millstone by rotational speed reducer, at the same time the wind enter into the raw mill from the air inlet, material through the screw feeder fell in the middle of the raw mill, under the action of centrifugal force, the raw materials move uniformly from central to the edge of the millstone, the materials will be ground by the roller when it pass through the grinding roller way, large materials is directly crushed. Crushed material continues to move to mill edge, until being taken away by the wind ring in strong turbulence, and larger particles material again fell to the mill to continue to crush, flow of materials through the upper part of the separator, in the effect of separator blade, coarse particle back to grinding mill, qualified fine powder with airflow is out of raw mill, and collected by the powder collection.

cement ball mill

The cement ball mill usually can be applied to raw meal grinding or cement grinding. Besides, cement ball mill also can be used for metallurgical, chemical, electric power, other mining powder grinding, and other grindable materials.

  • Application: limestone, clay, coal, feldspar, calcite, talc, iron ore, copper, phosphate, graphite, quartz, slag.
  • Capacity: 0.65-615T/H
Advantages

High output: large crushing ratio and strong production capacity effectively improve the grinding fineness, and the processing capacity is increased by about 15%. 

Safe and reliable system: the maintenance of the reduction gear and gear is more convenient, firm and wear-resistant, and also reduces the downtime, maintenance time and the labor intensity of the operators.

Good wear resistance and long service life: Cement ball mill adopts the high-quality wear-resisting material, and the lining can be removed, therefore the service life of the equipment or vulnerable part are all longer.

how it works?

The main working part of cement ball mill occurred in low speed rotary cylinder, when the cylinder is drove to rotary, grinding medium is attached on the liner to rotary together due to the effect of inertial centrifugal force, and taken to a certain height, freely fall because of gravity, grinding medium break the materials in cylinder body, at the same time the grinding body in rotary raw mill have circular motion, also can produce sliding and rolling, which result in grinding among the grinding medium, liner and materials. When the material is crushed and ground by impact, the material flows slowly from the feeding end to the discharging end to finish the grinding operation.

Notes for raw mill in cement plant

The raw mill is a kind of necessary cement equipment in the cement plant. In the real working condition, but the large configuration will produce a bad effect on the cement plant, so it is very important to set a reasonable configuration of the raw mill. There are five reasons why we control the configuration of the raw mill in cement plant:

  1. Increase power consumption: frequently start-stop of the raw mill causes power consumption to increase. At the same time, in the initial stage of starting up, the system material does not reach the normal operating load. There is also a gradual increase process, which also increases power consumption.
  2. Composition fluctuation of the raw meal: The frequently start-stop of a raw mill will bring different degrees of influence on the quality, whether it is the cement ball mill, the vertical cement mill or the cement roller press system.

  3. Instability of kiln dust mixing: kiln ash is part of raw meals not collected by the cyclone preheater. The raw meal has been preheated by the preheater and partly decomposed. At present, there is a special silo for mixing kiln ash. Relatively speaking, the amount of kiln ash is relatively large when the raw mill is stopped, which has a great impact on calcination.
  4. Waste of waste gas heat: The stop of the raw mill will have a great impact on the heat consumption of the whole system. If the capacity of the raw mill is small, reduce the downtime of the raw mill roller, basically can run in sync with the kiln, which is very beneficial to energy-saving, the waste heat of waste gas at the end of the kiln will be fully utilized.
  5. Instability of SO2 concentration: In the actual production, the raw material system really plays a role in reducing sulfur, the SO2 concentration in the exhaust gas can be reduced to about 100mg/Nm3. The start-stop of the raw mill has a great influence on the concentration of SO2in the waste gas of kiln tail.
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